Goat anti-human IgA + IgG + IgM is a secondary antibody, which binds to human IgA, IgG and IgM and is FITC (fluorescein-5-isothiocyanate) conjugated. Amax = 494 nm, Emax = 518 nm. Fluor to protein ratio is 3-7 moles FITC per mole antibody. Antibodies are affinity purified using solid phase human IgG + IgA + IgM.